Question

a quantum of light having energy E HAS WAVELENGTH OF 7200A0 FREQUENCY OF LIGHT WHICH CORESPONDS TO ENERGY TO 3E IS

Answer 1

Use E = hc/lambda
Find the relation betweenthe wavelengths and use it to find the frequency.

Answer 2

The frequency of the light is $1.25 \times 10^{15} s^{-1}$

Given:

Wavelength = $7200 \dot{\mathrm{A}}$

Light of energy = 3E

Solution:

The energy of the light and the wavelength of light is inversely proportional to each other.

Relationship between wavelength and frequency and wavelength is given below:

$Frequency =\frac{c}{\lambda}$

Where,

c = Velocity of light (m/s)

$\lambda$ = Wavelength (1/m)

$f=\frac{3 \times 3 \times 10^{8}}{7200 \times 10^{-10}}$

$f=1.25 \times 10^{15} s^{-1}$